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Re: [RESEND PATCH 0/7] serial: Add MMIO & SPCR support

From: Daniel Kiper
Subject: Re: [RESEND PATCH 0/7] serial: Add MMIO & SPCR support
Date: Wed, 21 Dec 2022 15:15:27 +0100
User-agent: NeoMutt/20170113 (1.7.2)

On Fri, Dec 02, 2022 at 10:05:19AM +1100, Benjamin Herrenschmidt wrote:
> This series adds support for MMIO serial ports and auto-configuration
> via ACPI SPCR.
> This is necessary for the serial port to work on AWS EC2 "metal" x86
> systems.
> An MMIO serial port can be specified explicitely using the
> "mmio," prefix for the --port argument to the 'serial' command,
> the register access size can also be specified via a suffix,
> and when 'serial' is used without arguments, it will try to use
> an ACPI SPCR entry (if any) to add the default port and configure
> it appropriately (speed, parity etc...)
> This was tested using SPCR on an actual c5.metal instance, and using
> explicit instanciation via serial -p mmioXXXXXXXX on a modified qemu
> hacked to create MMIO PCI serial ports.

First of all sorry for very late reply. I sent you my comments. There
are some important problems plus some nitpicks which have to be fixed.
Though I like the patch set in general. Than you for doing this work.


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